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參數(shù)資料
| 型號： | P89V51RB2FA,529 |
| 廠商： | NXP Semiconductors |
| 文件頁數(shù)： | 32/80頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC 80C51 MCU FLASH 16K 44-PLCC |
| 產(chǎn)品培訓模塊： | Migrating from 8/16-Bit MCUs to 32-Bit ARMs |
| 標準包裝： | 156 |
| 系列： | 89V |
| 核心處理器： | 8051 |
| 芯體尺寸： | 8-位 |
| 速度： | 40MHz |
| 連通性： | SPI，UART/USART |
| 外圍設(shè)備： | 欠壓檢測/復位，POR，PWM，WDT |
| 輸入/輸出數(shù)： | 32 |
| 程序存儲器容量： | 16KB（16K x 8） |
| 程序存儲器類型： | 閃存 |
| RAM 容量： | 1K x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 4.5 V ~ 5.5 V |
| 振蕩器型： | 內(nèi)部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 44-LCC（J 形引線） |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 706 (CN2011-ZH PDF) |
| 配用： | 622-1017-ND - BOARD 44-ZIF PLCC SOCKET 622-1001-ND - USB IN-CIRCUIT PROG 80C51ISP |
| 其它名稱： | 568-2427-5 935278706529 P89V51RB2FA-S |
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P89V51RB2_RC2_RD2_5
NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 05 — 12 November 2009
38 of 80
NXP Semiconductors
P89V51RB2/RC2/RD2
8-bit microcontrollers with 80C51 core
6.6.2 Mode 1
10 bits are transmitted (through TXD) or received (through RXD): a start bit (logical 0), 8
data bits (LSB rst), and a stop bit (logical 1). When data is received, the stop bit is stored
in RB8 in Special Function Register SCON. The baud rate is variable and is determined
by the Timer 1
2 overow rate.
6.6.3 Mode 2
11 bits are transmitted (through TXD) or received (through RXD): start bit (logical 0), 8
data bits (LSB rst), a programmable 9th data bit, and a stop bit (logical 1). When data is
transmitted, the 9th data bit (TB8 in SCON) can be assigned the value of 0 or (e.g. the
parity bit (P, in the PSW) could be moved into TB8). When data is received, the 9th data
bit goes into RB8 in Special Function Register SCON, while the stop bit is ignored. The
baud rate is programmable to either 1
16 or
1
32 of the CPU clock frequency, as determined
by the SMOD1 bit in PCON.
6.6.4 Mode 3
11 bits are transmitted (through TXD) or received (through RXD): a start bit (logical 0), 8
data bits (LSB rst), a programmable 9th data bit, and a stop bit (logical 1). In fact, mode 3
is the same as mode 2 in all respects except baud rate. The baud rate in mode 3 is
variable and is determined by the Timer 1
2 overow rate.
Table 25.
SCON - Serial port control register (address 98H) bit allocation
Bit addressable; Reset value: 00H
Bit
7
6
5
4
3
2
1
0
Symbol
SM0/FE
SM1
SM2
REN
TB8
RB8
TI
RI
Table 26.
SCON - Serial port control register (address 98H) bit description
Bit
Symbol
Description
7
SM0/FE
The usage of this bit is determined by SMOD0 in the PCON register. If
SMOD0 = 0, this bit is SM0, which with SM1, denes the serial port
mode. If SMOD0 = 1, this bit is FE (Framing Error). FE is set by the
receiver when an invalid stop bit is detected. Once set, this bit cannot
be cleared by valid frames but can only be cleared by software. (Note:
It is recommended to set up UART mode bits SM0 and SM1 before
setting SMOD0 to ‘1’.)
6
SM1
With SM0, denes the serial port mode (see Table 27 below).
5
SM2
Enables the multiprocessor communication feature in modes 2 and 3.
In mode 2 or 3, if SM2 is set to ‘1’, then RI will not be activated if the
received 9th data bit (RB8) is ‘0’. In mode 1, if SM2 = 1 then RI will not
be activated if a valid stop bit was not received. In mode 0, SM2
should be ‘0’.
4
REN
Enables serial reception. Set by software to enable reception. Clear by
software to disable reception.
3
TB8
The 9th data bit that will be transmitted in modes 2 and 3. Set or clear
by software as desired.
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